Switching device for electric circuits



Sept. 15, 1925'.

`P.zARs ET AL SWITCHINGEDEVLCE FOR ELECTRIC CIRCUITS Filed Sept. 1'7| 1921 Patented Sept. 15, 1925.

UNITED STATES PATENT OFFICE.

PAUL ZARS, OF DUSSELDORF-GRAFENBRG, AND SVEND DY HR, BERLIN-CHARLOTTEN- BURG, GERMANY, ASSIGNORS T0 DEUTSCHE SCHWEISSMASCHINENFABRIK BECKER c CO. A.G., OF BERLIN-SCHONEBERG, GERMANY. i

SWITCHING DEVICE FOR ELECTRIC CIRCUITS.

Application led September 17, 1921. Serial No. 501,220.

To @ZZ whom t may concern.'

Be it known that' we, PAUL ZARs and SvnNn DYHR, citizens ot Germany and Denmark, respectively, residing at Dusseldorf- Gratenberfr, Germany, and Berlin-Charlottenburg, ermany, respectively, have invented certain new and useful Improvements in Switching Devices for Electric Circuits, of which the following is a specification. Y

This invention relates in general to switching devices and more particularlytow devices ot' this 'kind which intermittently open or close an electric circuit or circuits in quick succession. l

In mechanical devices of this kind the rapid blows of the circuit-closing members or contacts on each other give rise to dis-y turbing noises, and the springs used hitherto tor damping the blows and reducing the concussion produce undesirable secondary vibrations ot the contacts. i

It is an object ot this invention to remove these drawbacks. This is accomplished by positively moving or guiding the cooperating contacts relatively to each other.

In the drawings affixed to this specification and forming part thereof our invention is illustrated diagrammatically by way ot example. In the drawings- Fig. l shows an oscillating make-andbreak switch whose contact-making members are `moved by cams or eccentrics driven by ashaft,

Fig.y 2 shows a similar switch with cush-` ioned contacts, and i Fig. 3 illustrates a third form of a contact in accordance with this, invention.

In Fig. 1, a designates a base plate consisting of an insulating substance and 6,.

c, Z are metal brackets to each ot which a leaf spring e, 7, and g respectively is attached. Each of these springs is an electrical conductor connected to a wire m, ff/ and c respectively and carries av contact L, c' and Z1:

respectively adapted to open and close any y eliminated.

l to a cam or the like as t and u respectively .arranged on a common shaft w.

l/Vhen the shaft w rotates the rods 1 and s move to and tro, one ot them oscillating the contacts hand 7c, and the other s oscillating the Contact c'. By proper adjustment ot the two eccentrics t and u with respect to each other the contacts can be made to close and open their respective circuitsin any desired manner. TheJ striking ot the contacts against each other causes only very littlek noise and the4 undesirable secondary vibrations of the contacts are practically The switching device described in the preceding` paragraph is a make-and-break switch in whichV the current supplied t0 the middle contact c' is sent'thrcugh the two outer contacts Zt and Z0 alternately. It one ot the outer contacts Zt or 7s were omitted the device could be employed as a simple interrupter.

A feature of the invention consists in its being possible to regulate the duration ot the intervals of closure or interruption of the vcircuits by shifting the clamping devices o, p or g on the rods r or s.

It the members Z, mand n are made rigid instead of resilient the clamping devices 0, pf and g must be made resilient or in the form ofv movable joints so as to permit oit variations of the distances between the contact carrying members.

Instead of operating the contacts 71"Z and 7c by control gear thatv is completely positive in action, the arrangement could be such that. the contacts ZL, z' and are coupled to the rods r and s only in certain positions of their travel.

The contact supports c, f and g may be made rigid instead of resilient and joined to the brackets b, c and Z by hinges.

Instead "of making the members Z, m and a resilientthat connect the contacts ZL, a' and c to the eccentrics t and u, spring niembers may be inserted in the rods c and The contacts ZL and 7c need not be driven by a common eccentric t, but in accordance with another feature of the invention a separate eccentric or the like may be used tor each contact.

Another 'feature oiE the invention consists in making the contacts ot the device of bodies consisting oi copper wire (such as the gauze used for dynamo brushes) -for the purpose of reducingnoises causedby the contacts striking against each other.

A device with an oscillating cushioned contact arranged between twolateial lcontacts is shown in Fig. 2. The middle contact comprises the support il, a soft intermediate piece i2 consisting, say, ot copper gauze, and the two contact caps 3 and 4. One of the two counter contacts comprises a support al, the soft intermediate body 7a2 and the cap h3, while the other counter contact comprises the support icl, the soft intermediate piece k2 and the cap 7c3. Thus in this device the gauze bodies h2, z, and 792 do not make and break the .contacts themselves, but only act as conducting, sound-damping or mailing members associated with the contact-making parts 7a3, 713, c', and 7c3.

In Fig. 3 79 is a contact support and 7c, a contact of copper gauze that makes and breaks contact itself.

The bodies of copper gauze may, oi course, be replaced by bodies consisting of small bundles of wire or the like.

le wish it to be understood that we do not desire to be limited to the exact details oi construction shown and described, `for obvious modifications will occur to a person skilled in the art.

le claim 1. A switching device for electric circuits comprising, a plurality of cooperating contacts, a vprimary cam 'for postively actuating some of the said contacts, a secondary cam for positively actuating another of the said contacts, and resilient connecting members between the said cams and the said contacts.

2. A switching device for electric circuits comprising, a plurality of cooperating contacts, a'primary positively-operating driving means for actuating one of the said contacts, a secondary positively-operating driving means for actuating another of the said contacts, and means for regulating the intei-vals of closure of .the cooperating contacts. n

3. A switching device for electric circuits comprising, a plurality of cooperating contacts, a plurality of separate driving means, one foreach said contact, and means for regulating the intervals orf .closure of the cooperating contacts` 4. A switching device for electric circuits comprising, a plurality of cooperating contacts, a primary cam for positively actuating some of the said contacts, a secondary cam for positively actuating another of the said contacts, and means for regulating the intervals or closure of the cooperating' contacts.

5. A switching device for electric circuits comprising, a plurality oit cooperating contacts, a primary positively-operating driving means for actuating one of the said contacts,

a secondary positively-,operating driving means for actuating another .of the said cont s, resilient connecting members between tie said Vdriving means and the said contests, and f0.1" ,regulating the intervals of closure of the cooperating contacts.

6. A switching device for electric circuits comprising, a plurality of cooperating contacts, a primary cam for positively actuating some of the Sold contacts, a secondary cam 7. A switching device 4for 4electric circuits comprising, a plurali-ty of cooperating contacts, cams, motion-transmitting members adapted to be actuated by the said cams, and

coupling members J01' coupling the contacts to the motion-transmitting members, the positions oi the coupling members being adjustable relatively to each other, whereby the intervals of closure of Vthe `said cooperating contacts may be regulated.

8. A switching device for electric circuits comprising, .a plurality of cooperating sound-deadening contacts, a primary positively-operating driving means for actuating `one of 1the said contacts, a secondary positively-operating driving means lfor actuating another .of the .said contacts, and resilient connecting members between the said driving meansand the said contacts.

`9. A switching device for electric circuits comprising, a pluralitytof cooperating sounddeadening contacts, a .primary cam for positively actuating some of the said contacts, a secondary cam for positively actuating an other of the said contacts, and resilient con necting members between the said cams and the said contacts.

l0. switching device for electric circuits comprising, a plurality of cooperating sounddeadening contacts, a primary positivelyoperating driving means'for actuating one of the said contacts, a secondary positivelyoperating derivino means for kactuating another ofthe contacts, Yand means for regulating the intervals of closure of the cooperating contacts.

ll. A switching dev-ice for electric circuits con'iprising, a plurality oi cooperating contacts, a pri-mary positively-operating driving means for actuating one of the said contacts, and a secondary positively-operating driving means 4for actuating another of the'said contacts, the said contacts comprising, sounddeadening members of divided yielding metal.

12. A switching device for electric circuits comprising, .a .plurality of cooperating contacts, a primary `.positively-operating driving means for actuating one of the said contacts, and a secondary positively-operat- -Uli ingdriving means for actuating another of the said contacts, the said contacts comprising, sound-deadening members of copper gauze.

13. A switching device for electric circuits comprising, a plurality of cooperating contacts, a primary positively-operating driving means for actuating one of the said contacts, anda secondary positively-operating driving means for actuating another of 10 the said contacts, the said contacts comprising, sound-deadening members of divided yielding metal, and solid contact-making caps.

. In testimony whereof We have signed this 15 specification.

PAUL ZARS. SVEND DYHR. 

